Elevator doorstop



J'. H. BoRDl-:N

ELEVATOR DOORSTOP Nov. 11, 1941.

`Filed Nov. 6, 1959 orifice near the end `and description in Patented Nav, `11, 1941 EnEvAToR Doonsror Joseph `My invention "relates tol means for controlling the speed of operation andstopping arr elevator door or the like upon opening orclosing;

It has been found that the speed of `operation of a `door may be kept-within narrow limits not only vduring itsfmovement but also during the checking or stopping period by the use of a small, submerged orice and a graduated needle for controlling thesize of and eventually closing the of the stroke.

More specifically, my invention comprises: a sliding door for elevators or the like, a pivotally mounted linkage con-nectedl at one end to said Borden, L Philadelphia, Pa., assignor to y Y Atlantic Elevator Co.,

4 Inc., Philadelphia, Pa., a corporation of `Pve'mjisylvania p l i.

- Application November c, leaalserial No. 303.096

` by Aa spring I1.

door, pistons connected to the opposite end of said linkage, cylinders co-operating with said pistons and containing liquid, a passage for the supply of` said liquid to the space between said piston and -said cylinder as said piston moves to one Y end of its stroke, a submerged orifice controlling the escape of liquid from between said piston and said cylinder as` said piston moves to the opposite end of its stroke, and a graduated needle controlling the sizeof said orifice `and eventually closing it as vsaid piston moves tothe end of its stroke.f i

For a further exposition of my invention, reference may be had to the annexed drawing and specification atthe end thereof my invention will bev speciiically pointed out and claimed.

`In the drawing: Fig. 1 is a front elevation parts broken away and` with the alternate posi- `tion shown in dotted lines.

of my device with Fig. 2 is a side elevation of the door-checking e mechanism shown in the upper part of Fig. 1.

Fig. 3 is a longitudinal cross-section, on an enlarged scale, of the piston and cylinder forming a part of my device.

Fig. 4 is a fragmentary longitudinal cross-sec-` tion on a still further increased scale showing the piston and cylinder at one end of the stroke.

In that embodiment of my invention chosen from among others for illustrationin the drawing thespecication my device is shown as consisting of a'track or rail I on which is mounted a sliding door 2 for an elevator or the like by means of wheels or rollers 3 carried in hangers 4.

Fast to door 2 is a linkage comprising a lever 5 having pivotalconnection with a second lever 6 which, in turn, is mounted on a stationary pivot 1 and which carries at its upper end a crossend pins 9 which are pivotally connected With orifice can be'nicely calculated .ini duplicate so that suiiice.Y Piston rod I cause of the sloping sides of brackets I0 which, in turn, are connected to piston rods II.

The vcylinder and piston mechanism is provided a description `of but `one will I`I carries at its inner end a. pin I2Y to which is attached a piston I3 having a port I4 therein. A plate I5 closes one end of port I 4 and is provided with an orifice IB best seen in Fig. 3 therethrough. Plate I5 has a sliding movement transversely of piston I3 and is yieldingly held against this sliding movement Piston I3 also has a passage I8 of large size relative to orifice I 6 passing therethrough. Passage I8 is controlled by a ball or like valve I9.

Cylinder 20 receives piston I3 slidably therein and is adapted to contain a liquid (omitted from the drawing for the sake of clarity).

around piston rod II. At its opposite end, cylinder 2U carries a graduated needle 22 detachably f mounted in position by 'means of a support 23 cylinder 20 is at thelower end of its stroke. Y

Referring now to Fig. 3, if the cylinder 20 is assumed tro be the left-hand cylinder in Fig. 1, the piston I3 is moved downward or toward the right as seenin Fig. 3. The ball-valve I9 closes the passage I 8v so that the escape of oil from the space between the piston I3 and the yoke 24 is governed .by the orifice I6. The size of this so that the variation in response to temperature of the discharge from the orifice can be held in As piston I3 nears the end of its stroke, needle 22 enters orifice I6 in plate I5 and there- `fore changes the size of this orifice and eventually closes it. The size of orifice I6 is large with respect to the end or point of needle 22 and the lateral movement of plate I5,` the plate I5 is prop,

and hence substantially free movement of pis.

ton I3 in cylinder 20. I do not intend to be of the prior art and of the attached claims may tively small area and a limited save as the scope passage of relatively large section of said bypass,

1. An hydraulic control and checking means'- for elevator and like doors comprising: a cylinder having liquid therein, a yoke closing one end of said cylinder, a piston mounted for travel in said cylinder toward and away from said yoke, provisions constituting a passage forv supplying liquid to the space between said piston and said yoke as said piston travels away from said yoke, a disk mounted in said piston for lateral movement and having an orifice therethrough providing for the escape of liquid from between said piston and said yoke as said piston travels toward said yoke, and a graduated needle co-operating with said piston and arranged to vary the size of and eventually close said orice as said piston travels closest to said yoke.

2. In a speed controller and check for an elevator door or the like, a cylinder adapted to be mounted adjacent said door, a pair of aligned liquid-containing chambers in said cylinder, said chambers being connected by a bypass of relacheck valve controlled area, a disk mounted in said bypass for lateral movement and having a hole therethrough forming the smallest crossa piston mounted in said cylinder between said chambers and arranged for connection with said door, and a graduated needle co-operating with said disk and arranged to center the disk thereon and to vary the size of and eventually close said holeas said piston nears the end of Aits stroke in one direction.

3. In the,combination according to claim 2, a spring stressing on said disk and arranged to hold it yieldingly against lateral motion.

JOSEPH H. BORDEN. 

